title does not need to be required

Author: domfarolino

index.bs

@@ -704,7 +704,7 @@ dictionary RegisteredTool {
   // `title` can be exposed as a `DOMString` since it was taken in by a
   // `USVString`, meaning all unmatched surrogate processing has already been
   // done, and there's no need to do it again on tool exposure.
-  required DOMString title;
+  DOMString title;
   required DOMString description;
   DOMString inputSchema;
   required Window window;